The BPX is a compact Dolby Digital ready bipolar rear/side surround speaker intended for on-wall, shelf or stand mounting. Like our centre channels, it is built to the same high construction and performance standards as our main front speakers and includes features like high definition bass/midrange driver with butyl rubber surround, wide-dispersion pure aluminium dome tweeter with magnetic cooling fluid, complex Linkwitz-Riley crossover network and a solid monocoque cabinet with diffractionless grille/baffle interface.